Ukuthuthukiswa kanye nokusetshenziswa kwei-polycarboxylic superplasticizerkuyashesha uma kuqhathaniswa. Ikakhulukazi kumaphrojekthi amakhulu nabalulekile afana nokongiwa kwamanzi, amandla kagesi, ubunjiniyela bamanzi, ubunjiniyela basolwandle, namabhuloho, i-polycarboxylate superplastisizer isetshenziswa kabanzi.
Ngemuva kokuthi usimende uxutshwe namanzi, udaka lukasimende lwakha isakhiwo se-flocculation ngenxa yamandla adonsela phansi ezinhlayiya zikasimende, ukuze u-10% kuya ku-30% wamanzi okuxuba ahlanganiswe ezinhlayiyeni zikasimende futhi angakwazi ukuhlanganyela ekugelezeni kwamahhala kanye nokugcoba. , ngaleyo ndlela kuthinte i-Flowability yokuxuba ukhonkolo. Lapho i-supreplasticizer ingeziwe, ama-athomu e-ejenti yokunciphisa amanzi angakhangiswa ngendlela eqondile ebusweni bezinhlayiya zikasimende, ukuze izindawo ezingaphezulu zezinhlayiya zikasimende zibe nokushaja okufanayo (imvamisa ukushaja okungekuhle), okwenza i-electrostatic repulsion, ekhuthaza ukuhlangana. ukuhlakazwa kwezinhlayiya zikasimende kanye nokubhujiswa kwesakhiwo se-flocculation. , ukukhulula ingxenye yamanzi asongwe ukuze abambe iqhaza ekugelezeni, ngaleyo ndlela akhulise ngokuphumelelayo uketshezi lwengxube yekhonkrithi.
Iqembu le-hydrophilic ku-i-ejenti yokunciphisa amanzii-polar kakhulu, ngakho-ke ifilimu ye-adsorption ye-ejenti yokunciphisa amanzi ebusweni bezinhlayiya zikasimende ingenza ifilimu lamanzi elizinzile elinama-molecule amanzi. Le filimu yamanzi inomphumela omuhle wokugcoba futhi inganciphisa ngempumelelo ukumelana nokuslayida phakathi kwezinhlayiya zikasimende, ngaleyo ndlela ithuthukise uketshezi lodaka nokhonkolo.
Iketanga legatsha le-hydrophilic ku-i-superplasticizerisakhiwo sinwebeka esixazululweni esinamanzi, ngaleyo ndlela sakhe isendlalelo se-hydrophilic se-adsorption enezinhlangothi ezintathu ezinogqinsi oluthile ebusweni bezinhlayiya zikasimende ezikhangisiwe. Lapho izinhlayiya ze-samente ziseduze komunye nomunye, izingqimba ze-adsorption ziqala ukudlulana, okungukuthi, ukuvinjelwa kwe-steric kwenzeka phakathi kwezinhlayiya ze-cement. Uma kunqwabelana kakhulu, kukhulu ukunyanyeka kwe-steric, futhi kukhulu ukuvinjwa kokuhlangana phakathi kwezinhlayiya zikasimende, okwenza udaka nokhonkolo I-Slump ihlale iyinhle.
Ngesikhathi kulungiselelwa inqubo yei-ejenti yokunciphisa amanzi ye-polycarboxylate, amanye amaketanga anamagatsha axhunyelelwa kuma-molecule e-ejenti yokunciphisa amanzi. Lolu chungechunge lwamagatsha aluhlinzeki nje kuphela ngomphumela wokuvimbela i-steric, kodwa futhi, endaweni ephakeme ye-alkalinity ye-samente hydration, Iketanga legatsha lingabuye linqunywe kancane, ngaleyo ndlela likhulule i-polycarboxylic acid ngomphumela wokuhlakazeka, ongathuthukisa umphumela wokuhlakazeka kwezinhlayiya zikasimende futhi lawula ukulahleka kokuwohloka.
Isikhathi sokuthumela: Mar-29-2024